Aluminium alloys.



w. N. NAYLOR & s. PQHUTTON.

ALUMINIUM ALLOYS.

APPLICATION FILED NOV. 22, 1912.

Patented Mar. 14, 1916.

NVENTORS W. NNAYLQ S. P. H UTTON W Y 7 E N o T T An WALTER N. NAYLOR, OFFOREST HILL, LONDON, AND STANLEY P. HUTTON, OF

BECKEN HAM, ENGLAND.

ALUMINIUM ALLQYS.

Specification of Letters Patent.

Patented Mar. 14, 1916.

Application filed November 22, 1912. Serial No. 732,972.

To all whom it may concern:

Be it known that we, WALTER NoRT'H- corn NAYLOR and STANLEY PAGE HUTTON,citizens of the United Kingdom of Great Britain and Ireland, andresidents of 169 Stanst'ead road, Forest Hill, in the county of London,England, and 30 Manor road, Beckenham, in the county of Kent, England,respectively, have invented certain new and useful Improvements in andRelating to Aluminium Alloys, of which the following is a specification,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to aluminium alloys and has for its object toprovide an improved alloy or alloys and a process or processes formaking same.

In another sense the invention may be considered as a treatment ofaluminium, whereby the metal is increased in strength and whereby theWasting or aging which occurs in aluminium is prevented and the metalrendered non-corrosive when sub-- mitted to the action of salt water.

According to this invention I add to aluminium a certain percentage ofmagnesium and phosphor tin, some phosphorus may be added in addition ifrequired and for certain purposes a percentage of phosphor copper may beadded to the mixture to increase the tensile strength. The percentage ofmag nesium generally exceeds that of the tin and the percentage ofmagnesium is varied according to the purpose for which the alloy isrequired. For example, the'magnesium is reduced when the metal is to berolled or drawn. For other purposes,

creased tensile strength'the alloy may be.

varied as follows: 1?} lbs. aluminium, 11 ozs.

' ma nesium 13} ozs. hos )hate co er 3 bottom of the crucible,

as for example, dental purposes, a small quantity of metallicv grins.phosphor tin. For dental purposes it may be varied as follows: 4: lbs.aluminium, oz. magnesium, l grm. phosphor tin,2 grms. metallic sodium.

An alloy such as above referred to may be prepared by the followingprocess and by apparatus. f

Figure 1 of the accompanying drawings shows the apparatus together witha crucible. A quantit'y'of aluminium is melted in a crucible a and tothis is added at a temperature of about 600 C. or thereabout apercentage of magnesium and phosphor tin. The magnesium and phosphoratedtin are incorporated with the aluminium by means of a special device inthe form of a tube or casing 6 through which the magnesium is made toenter the molten aluminium at the this method being adopted owing to thelow melting point and specific gravity of the magnesium. The tube orcasing 12 is cylindrical and open at its lower end and it is fitted witha plunger or piston c and sliding rod d of which passes up through thetube and extends for a considerable distance beyond same.

7 In use the tube 6 is charged with pieces or blocks of magnesium e withpieces of phosphorated tin f placed in between. The sliding rod is drawnout as shown to the left of the figure for the purpose of charging thetube and a suitable wad of paper or other fabric 9 is placed between theend of the piston and the hole through which the rod slides. The openend of the tube is now blocked with a wad so as to keep it in place. Atthe required time the tube charged as described is thrust with its openend downward into the molten aluminium.

The contained magnesium and phosphor tin are quickly melted out and flowinto and mix with the aluminium in the crucible. the

. weight of the plunger or sliding rod d assists in forcing out thecontents of the tube as it descends, and the position of the said rodserves to indicate when the metal has been properly melted out anddiffused. The

molten metal thus mixed may be suitably stirred with a carbon stick Orin other suitable manner to insure a thorough incorporation of themagnesium with the alumini- I um. The upper end of the sliding rod (2may be fitted with a smaller bell-shaped cavity or cup h whereby anyfurther addition of small quantities of phosphorus may be made bywrapping a piece of phosphorus in tin foil and inserting it in the saidcup, the cup being then metal. The small cup k may if required be madeas a separate tool at the end of a rod. Fig. 2 of the drawings shows amodified form of the improved device wherein a shallow bell-shapedcasing b is provided and fitted with a piston 0 having an extended rodas before described. \Vith this conmay be dealt with as indicatedinstead of small pieces as in Fig. 1. A removable cross-bar j isprovided for keeping the blocks of metal in place until melted.

plunged into the moltenstruction a substantially large block of metal Inwitness whereof we have hereunto set v our'hands in presence of twowitnesses.

W. N. NAYLOR. STANLEY P. HUTTON.

Witnesses: WALTER I. SKERTEN, JOHN W. PA'roHme.

